What its called if handover happens in idle mode

I have moved my device from 2g to LTE location. What its called?

Is it handover or cell reselection?

And after moving from 2g to lte area what process it starts? Its showing tracking area update.

Yeah if you move from idle mode from 2G/3G to LTE then it is called reselection and once the UE moves to LTE, it needs to tell the core that it has moved to another RAT and thus, it needs to do a Tracking Area Update.